The Structure of Tetrabutylammonium Bromide Hydrate (C4H9)4NBr·21/3H2O

Enhanced Selectivity of the Separation of CO2from N2during Crystallization of Semi-Clathrates from Quaternary Ammonium Solutions

“…(2005) Lipkowski (2002) TBAB Type A, from Darbouret (2005a) TBAB Type B, from Darbouret (2005a) TBAB Type B, from Sato et al . (2013) 0 2 0 4 0 6 0 8 0 Figure 1 T,x-phase diagram of TBAB-water binary system in the region of crystallization of clathrates polyhydrates (Oyama et al, 2005;Lipkowski et al, 2002;Darbouret, 2005). which are enclathred in the cavities without modifying the structure of the hydrates. This kind of hydrate is still called clathrate hydrate and its structure belongs to the classical sI, sII or sH structure.…”

“…TBAB has been extensively studied in reason of a direct application for air conditioning as a phase change material (Lipkowski et al, 2002;Oyama et al, 2005;Kamata et al, 2004;Darbouret et al, 2005;Lin et al, 2008;Arjmandi et al, 2007;Li S. et al, 2009). Tetra butyl ammonium bromide salt forms at least four different structures with hydration number of 24, 26, 32 and 36 (Lipkowski et al, 2002).…”

“…Tetra butyl ammonium bromide salt forms at least four different structures with hydration number of 24, 26, 32 and 36 (Lipkowski et al, 2002). Only one of the crystallographic structures of semi-clathrate hydrates has been determined precisely by McMullan and Jeffrey (1959) and completed by Shimada (2005b).…”

“…air conditioning systems, the use of ice slurry is no longer applicable because the ice melting point cannot be adjusted to positive temperature. Several authors (Lipkowski et al, 2002;Obata et al, 2003;Oyama et al, 2005) have shown that some kind of quaternary ammonium can be used as PCM for air conditioning applications. For example, Tetra-Butyl Ammonium Bromide (TBAB) forms hydrate slurries very similar to ice slurries, but with a melting point that can be adjusted from 273.15 K to 285.15 K depending on the TBAB concentration (Fig.…”

Semiclathrate-based CO2 capture from flue gas mixtures: An experimental approach with thermodynamic and Raman spectroscopic analyses

“…To avoid and overcome this concern, gas hydrate formation needs to be performed at much milder pressure and temperature conditions. Thus, extensive efforts have been undertaken to reduce hydrate equilibrium pressures or to enhance hydrate equilibrium temperatures by adding thermodynamic promoters to the system [10,12,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Semiclathrates, which share many physical and chemical properties with gas hydrates, could be an attractive alternative to gas hydrates because in general, they can maintain their thermodynamic stability under atmospheric pressure conditions [19,[31][32][33][34][35][36][37][38][39]. In gas hydrates, the guest molecules are not physically bonded to host water lattices, whereas in semiclathrates, guest molecules can both take part in building the host water frameworks and occupy cages after breaking part of the cage structure.…”